我用cocos2d精灵创造了2个Box2d的身体….他们有不同的质量,他们从世界上的同一个地方坠落.但他们同时倒下了.我的想法是较轻的身体应该落后于较重的身体…..但他们没有.
for (int k=1;k<=2; k++) {
int idx = (CCRANDOM_0_1() > .5 ? 0:1);
int idy = (CCRANDOM_0_1() > .5 ? 0:1);
CCSprite *sprite = [CCSprite spriteWithBatchNode:batch rect:CGRectMake(32 * idx,32 * idy,32,32)];
[batch addChild:sprite];
sprite.position = ccp( p.x+(32*k),p.y);
b2BodyDef bodyDef;
bodyDef.type = b2_dynamicBody;
bodyDef.position.Set(( p.x+(32*k))/PTM_RATIO,p.y/PTM_RATIO);
bodyDef.userData = sprite;
b2Body *body = world->CreateBody(&bodyDef);
b2polygonShape dynamicBox;
dynamicBox.SetAsBox(.5f,.5f);//These are mid points for our 1m Box
b2FixtureDef fixtureDef;
fixtureDef.shape = &dynamicBox;
fixtureDef.density = 1.0f/k;
fixtureDef.friction = 0.3f;
body->CreateFixture(&fixtureDef);
NSLog(@"%f",body->GetMass());
}
解决方法
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